Ending / spoiler

Charlie's own brother, Luther/Beefy is behind the wheel of the cadillac, the woman Scott made out with was Charlie's own wife. Charlie is still alive and set on drowning his unfaithful wife and 'her' lover in a frozen lake, during the final chase brothers Scott & Robby together with pal CJ lure Charlie & Luther/Beefy off a cliff into the said frozen lake with the cadillac sinking into the depths, both brothers still inside. Their ride totalled the trio together with Charlie's wife make slowly but surely make their way over to the highway and (it seems) hitch hike.